Lagrangian Structure Function's Scaling Exponents in Turbulent Channel Flow

• 作者: 刘宇陆 卢志明 牛岛连夫 罗剑平 鬼頭修己
• 来源期刊: 中国物理快报(英文版)
• 学科: 数学
• 关键词: 标度指数 结构函数 拉格朗日 湍流流场 直接数值模拟 横向速度 ESS公司 槽道湍流
• 年，卷（期）: 2010,（2）
• 页码范围: 169-171
• 页数: 3页
• 分类号: O152.7 X823
• 语种: 英文

摘要

The Lagrangian structure function's scaling exponents and intermittency of three-dimensional incompressible turbulent channel flow are investigated by using direct numerical simulation. The intermittency in streamwise velocity increments is found to increase in the near-wall region, which can be attributed to the presence of strong mean shear and organized motions in the near-wall region. It is found that the intermittency of transverse velocity increments is weaker than that of longitudinal ones. The present ESS evaluation of ζL(q) for the structure function of the streamwise velocity component in the channel centre is fairly close to experimental estimates of isotropic turbulence.